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linux/drivers/video/amba-clcd.c
Russell King c43e6f027d [ARM] amba-clcd: Allow RGB555 and RGB565 with 16bpp 
Some folk want to use RGB555 rather tahn RGB565 with amba-clcd.
Allow amba-clcd to accept either pixel format.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-01-26 14:12:06 +00:00

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/*
* linux/drivers/video/amba-clcd.c
*
* Copyright (C) 2001 ARM Limited, by David A Rusling
* Updated to 2.5, Deep Blue Solutions Ltd.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*
* ARM PrimeCell PL110 Color LCD Controller
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/mm.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/list.h>
#include <linux/amba/bus.h>
#include <linux/amba/clcd.h>
#include <linux/clk.h>
#include <asm/sizes.h>
#define to_clcd(info) container_of(info, struct clcd_fb, fb)
/* This is limited to 16 characters when displayed by X startup */
static const char *clcd_name = "CLCD FB";
/*
* Unfortunately, the enable/disable functions may be called either from
* process or IRQ context, and we _need_ to delay. This is _not_ good.
*/
static inline void clcdfb_sleep(unsigned int ms)
{
if (in_atomic()) {
mdelay(ms);
} else {
msleep(ms);
}
}
static inline void clcdfb_set_start(struct clcd_fb *fb)
{
unsigned long ustart = fb->fb.fix.smem_start;
unsigned long lstart;
ustart += fb->fb.var.yoffset * fb->fb.fix.line_length;
lstart = ustart + fb->fb.var.yres * fb->fb.fix.line_length / 2;
writel(ustart, fb->regs + CLCD_UBAS);
writel(lstart, fb->regs + CLCD_LBAS);
}
static void clcdfb_disable(struct clcd_fb *fb)
{
u32 val;
if (fb->board->disable)
fb->board->disable(fb);
val = readl(fb->regs + CLCD_CNTL);
if (val & CNTL_LCDPWR) {
val &= ~CNTL_LCDPWR;
writel(val, fb->regs + CLCD_CNTL);
clcdfb_sleep(20);
}
if (val & CNTL_LCDEN) {
val &= ~CNTL_LCDEN;
writel(val, fb->regs + CLCD_CNTL);
}
/*
* Disable CLCD clock source.
*/
clk_disable(fb->clk);
}
static void clcdfb_enable(struct clcd_fb *fb, u32 cntl)
{
/*
* Enable the CLCD clock source.
*/
clk_enable(fb->clk);
/*
* Bring up by first enabling..
*/
cntl |= CNTL_LCDEN;
writel(cntl, fb->regs + CLCD_CNTL);
clcdfb_sleep(20);
/*
* and now apply power.
*/
cntl |= CNTL_LCDPWR;
writel(cntl, fb->regs + CLCD_CNTL);
/*
* finally, enable the interface.
*/
if (fb->board->enable)
fb->board->enable(fb);
}
static int
clcdfb_set_bitfields(struct clcd_fb *fb, struct fb_var_screeninfo *var)
{
int ret = 0;
memset(&var->transp, 0, sizeof(var->transp));
var->red.msb_right = 0;
var->green.msb_right = 0;
var->blue.msb_right = 0;
switch (var->bits_per_pixel) {
case 1:
case 2:
case 4:
case 8:
var->red.length = var->bits_per_pixel;
var->red.offset = 0;
var->green.length = var->bits_per_pixel;
var->green.offset = 0;
var->blue.length = var->bits_per_pixel;
var->blue.offset = 0;
break;
case 16:
var->red.length = 5;
var->blue.length = 5;
/*
* Green length can be 5 or 6 depending whether
* we're operating in RGB555 or RGB565 mode.
*/
if (var->green.length != 5 && var->green.length != 6)
var->green.length = 6;
break;
case 32:
if (fb->panel->cntl & CNTL_LCDTFT) {
var->red.length = 8;
var->green.length = 8;
var->blue.length = 8;
break;
}
default:
ret = -EINVAL;
break;
}
/*
* >= 16bpp displays have separate colour component bitfields
* encoded in the pixel data. Calculate their position from
* the bitfield length defined above.
*/
if (ret == 0 && var->bits_per_pixel >= 16) {
if (fb->panel->cntl & CNTL_BGR) {
var->blue.offset = 0;
var->green.offset = var->blue.offset + var->blue.length;
var->red.offset = var->green.offset + var->green.length;
} else {
var->red.offset = 0;
var->green.offset = var->red.offset + var->red.length;
var->blue.offset = var->green.offset + var->green.length;
}
}
return ret;
}
static int clcdfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
struct clcd_fb *fb = to_clcd(info);
int ret = -EINVAL;
if (fb->board->check)
ret = fb->board->check(fb, var);
if (ret == 0 &&
var->xres_virtual * var->bits_per_pixel / 8 *
var->yres_virtual > fb->fb.fix.smem_len)
ret = -EINVAL;
if (ret == 0)
ret = clcdfb_set_bitfields(fb, var);
return ret;
}
static int clcdfb_set_par(struct fb_info *info)
{
struct clcd_fb *fb = to_clcd(info);
struct clcd_regs regs;
fb->fb.fix.line_length = fb->fb.var.xres_virtual *
fb->fb.var.bits_per_pixel / 8;
if (fb->fb.var.bits_per_pixel <= 8)
fb->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR;
else
fb->fb.fix.visual = FB_VISUAL_TRUECOLOR;
fb->board->decode(fb, &regs);
clcdfb_disable(fb);
writel(regs.tim0, fb->regs + CLCD_TIM0);
writel(regs.tim1, fb->regs + CLCD_TIM1);
writel(regs.tim2, fb->regs + CLCD_TIM2);
writel(regs.tim3, fb->regs + CLCD_TIM3);
clcdfb_set_start(fb);
clk_set_rate(fb->clk, (1000000000 / regs.pixclock) * 1000);
fb->clcd_cntl = regs.cntl;
clcdfb_enable(fb, regs.cntl);
#ifdef DEBUG
printk(KERN_INFO "CLCD: Registers set to\n"
KERN_INFO " %08x %08x %08x %08x\n"
KERN_INFO " %08x %08x %08x %08x\n",
readl(fb->regs + CLCD_TIM0), readl(fb->regs + CLCD_TIM1),
readl(fb->regs + CLCD_TIM2), readl(fb->regs + CLCD_TIM3),
readl(fb->regs + CLCD_UBAS), readl(fb->regs + CLCD_LBAS),
readl(fb->regs + CLCD_IENB), readl(fb->regs + CLCD_CNTL));
#endif
return 0;
}
static inline u32 convert_bitfield(int val, struct fb_bitfield *bf)
{
unsigned int mask = (1 << bf->length) - 1;
return (val >> (16 - bf->length) & mask) << bf->offset;
}
/*
* Set a single color register. The values supplied have a 16 bit
* magnitude. Return != 0 for invalid regno.
*/
static int
clcdfb_setcolreg(unsigned int regno, unsigned int red, unsigned int green,
unsigned int blue, unsigned int transp, struct fb_info *info)
{
struct clcd_fb *fb = to_clcd(info);
if (regno < 16)
fb->cmap[regno] = convert_bitfield(transp, &fb->fb.var.transp) |
convert_bitfield(blue, &fb->fb.var.blue) |
convert_bitfield(green, &fb->fb.var.green) |
convert_bitfield(red, &fb->fb.var.red);
if (fb->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR && regno < 256) {
int hw_reg = CLCD_PALETTE + ((regno * 2) & ~3);
u32 val, mask, newval;
newval = (red >> 11) & 0x001f;
newval |= (green >> 6) & 0x03e0;
newval |= (blue >> 1) & 0x7c00;
/*
* 3.2.11: if we're configured for big endian
* byte order, the palette entries are swapped.
*/
if (fb->clcd_cntl & CNTL_BEBO)
regno ^= 1;
if (regno & 1) {
newval <<= 16;
mask = 0x0000ffff;
} else {
mask = 0xffff0000;
}
val = readl(fb->regs + hw_reg) & mask;
writel(val | newval, fb->regs + hw_reg);
}
return regno > 255;
}
/*
* Blank the screen if blank_mode != 0, else unblank. If blank == NULL
* then the caller blanks by setting the CLUT (Color Look Up Table) to all
* black. Return 0 if blanking succeeded, != 0 if un-/blanking failed due
* to e.g. a video mode which doesn't support it. Implements VESA suspend
* and powerdown modes on hardware that supports disabling hsync/vsync:
* blank_mode == 2: suspend vsync
* blank_mode == 3: suspend hsync
* blank_mode == 4: powerdown
*/
static int clcdfb_blank(int blank_mode, struct fb_info *info)
{
struct clcd_fb *fb = to_clcd(info);
if (blank_mode != 0) {
clcdfb_disable(fb);
} else {
clcdfb_enable(fb, fb->clcd_cntl);
}
return 0;
}
static int clcdfb_mmap(struct fb_info *info,
struct vm_area_struct *vma)
{
struct clcd_fb *fb = to_clcd(info);
unsigned long len, off = vma->vm_pgoff << PAGE_SHIFT;
int ret = -EINVAL;
len = info->fix.smem_len;
if (off <= len && vma->vm_end - vma->vm_start <= len - off &&
fb->board->mmap)
ret = fb->board->mmap(fb, vma);
return ret;
}
static struct fb_ops clcdfb_ops = {
.owner = THIS_MODULE,
.fb_check_var = clcdfb_check_var,
.fb_set_par = clcdfb_set_par,
.fb_setcolreg = clcdfb_setcolreg,
.fb_blank = clcdfb_blank,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
.fb_mmap = clcdfb_mmap,
};
static int clcdfb_register(struct clcd_fb *fb)
{
int ret;
fb->clk = clk_get(&fb->dev->dev, "CLCDCLK");
if (IS_ERR(fb->clk)) {
ret = PTR_ERR(fb->clk);
goto out;
}
fb->fb.fix.mmio_start = fb->dev->res.start;
fb->fb.fix.mmio_len = SZ_4K;
fb->regs = ioremap(fb->fb.fix.mmio_start, fb->fb.fix.mmio_len);
if (!fb->regs) {
printk(KERN_ERR "CLCD: unable to remap registers\n");
ret = -ENOMEM;
goto free_clk;
}
fb->fb.fbops = &clcdfb_ops;
fb->fb.flags = FBINFO_FLAG_DEFAULT;
fb->fb.pseudo_palette = fb->cmap;
strncpy(fb->fb.fix.id, clcd_name, sizeof(fb->fb.fix.id));
fb->fb.fix.type = FB_TYPE_PACKED_PIXELS;
fb->fb.fix.type_aux = 0;
fb->fb.fix.xpanstep = 0;
fb->fb.fix.ypanstep = 0;
fb->fb.fix.ywrapstep = 0;
fb->fb.fix.accel = FB_ACCEL_NONE;
fb->fb.var.xres = fb->panel->mode.xres;
fb->fb.var.yres = fb->panel->mode.yres;
fb->fb.var.xres_virtual = fb->panel->mode.xres;
fb->fb.var.yres_virtual = fb->panel->mode.yres;
fb->fb.var.bits_per_pixel = fb->panel->bpp;
fb->fb.var.grayscale = fb->panel->grayscale;
fb->fb.var.pixclock = fb->panel->mode.pixclock;
fb->fb.var.left_margin = fb->panel->mode.left_margin;
fb->fb.var.right_margin = fb->panel->mode.right_margin;
fb->fb.var.upper_margin = fb->panel->mode.upper_margin;
fb->fb.var.lower_margin = fb->panel->mode.lower_margin;
fb->fb.var.hsync_len = fb->panel->mode.hsync_len;
fb->fb.var.vsync_len = fb->panel->mode.vsync_len;
fb->fb.var.sync = fb->panel->mode.sync;
fb->fb.var.vmode = fb->panel->mode.vmode;
fb->fb.var.activate = FB_ACTIVATE_NOW;
fb->fb.var.nonstd = 0;
fb->fb.var.height = fb->panel->height;
fb->fb.var.width = fb->panel->width;
fb->fb.var.accel_flags = 0;
fb->fb.monspecs.hfmin = 0;
fb->fb.monspecs.hfmax = 100000;
fb->fb.monspecs.vfmin = 0;
fb->fb.monspecs.vfmax = 400;
fb->fb.monspecs.dclkmin = 1000000;
fb->fb.monspecs.dclkmax = 100000000;
/*
* Make sure that the bitfields are set appropriately.
*/
clcdfb_set_bitfields(fb, &fb->fb.var);
/*
* Allocate colourmap.
*/
fb_alloc_cmap(&fb->fb.cmap, 256, 0);
/*
* Ensure interrupts are disabled.
*/
writel(0, fb->regs + CLCD_IENB);
fb_set_var(&fb->fb, &fb->fb.var);
printk(KERN_INFO "CLCD: %s hardware, %s display\n",
fb->board->name, fb->panel->mode.name);
ret = register_framebuffer(&fb->fb);
if (ret == 0)
goto out;
printk(KERN_ERR "CLCD: cannot register framebuffer (%d)\n", ret);
iounmap(fb->regs);
free_clk:
clk_put(fb->clk);
out:
return ret;
}
static int clcdfb_probe(struct amba_device *dev, void *id)
{
struct clcd_board *board = dev->dev.platform_data;
struct clcd_fb *fb;
int ret;
if (!board)
return -EINVAL;
ret = amba_request_regions(dev, NULL);
if (ret) {
printk(KERN_ERR "CLCD: unable to reserve regs region\n");
goto out;
}
fb = (struct clcd_fb *) kmalloc(sizeof(struct clcd_fb), GFP_KERNEL);
if (!fb) {
printk(KERN_INFO "CLCD: could not allocate new clcd_fb struct\n");
ret = -ENOMEM;
goto free_region;
}
memset(fb, 0, sizeof(struct clcd_fb));
fb->dev = dev;
fb->board = board;
ret = fb->board->setup(fb);
if (ret)
goto free_fb;
ret = clcdfb_register(fb);
if (ret == 0) {
amba_set_drvdata(dev, fb);
goto out;
}
fb->board->remove(fb);
free_fb:
kfree(fb);
free_region:
amba_release_regions(dev);
out:
return ret;
}
static int clcdfb_remove(struct amba_device *dev)
{
struct clcd_fb *fb = amba_get_drvdata(dev);
amba_set_drvdata(dev, NULL);
clcdfb_disable(fb);
unregister_framebuffer(&fb->fb);
iounmap(fb->regs);
clk_put(fb->clk);
fb->board->remove(fb);
kfree(fb);
amba_release_regions(dev);
return 0;
}
static struct amba_id clcdfb_id_table[] = {
{
.id = 0x00041110,
.mask = 0x000ffffe,
},
{ 0, 0 },
};
static struct amba_driver clcd_driver = {
.drv = {
.name = "clcd-pl11x",
},
.probe = clcdfb_probe,
.remove = clcdfb_remove,
.id_table = clcdfb_id_table,
};
static int __init amba_clcdfb_init(void)
{
if (fb_get_options("ambafb", NULL))
return -ENODEV;
return amba_driver_register(&clcd_driver);
}
module_init(amba_clcdfb_init);
static void __exit amba_clcdfb_exit(void)
{
amba_driver_unregister(&clcd_driver);
}
module_exit(amba_clcdfb_exit);
MODULE_DESCRIPTION("ARM PrimeCell PL110 CLCD core driver");
MODULE_LICENSE("GPL");
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